Fix typo in create_index.sql.

Introduced by 578b229718.

Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Reviewed-by: Tender Wang <tndrwang@gmail.com>
Discussion: https://postgr.es/m/CAEZATCV_CzRSOPMf1gbHQ7xTmyrV6kE7ViCBD6B81WF7GfTAEA@mail.gmail.com
Backpatch-through: 13

src/test/regress/expected/create_index.out

@@ -1624,8 +1624,8 @@ DROP TABLE cwi_test;
 --
 CREATE TABLE syscol_table (a INT);
 -- System columns cannot be indexed
-CREATE INDEX ON syscolcol_table (ctid);
-ERROR:  relation "syscolcol_table" does not exist
+CREATE INDEX ON syscol_table (ctid);
+ERROR:  index creation on system columns is not supported
 -- nor used in expressions
 CREATE INDEX ON syscol_table ((ctid >= '(1000,0)'));
 ERROR:  index creation on system columns is not supported

src/test/regress/sql/create_index.sql

@@ -635,7 +635,7 @@ DROP TABLE cwi_test;
 CREATE TABLE syscol_table (a INT);
 
 -- System columns cannot be indexed
-CREATE INDEX ON syscolcol_table (ctid);
+CREATE INDEX ON syscol_table (ctid);
 
 -- nor used in expressions
 CREATE INDEX ON syscol_table ((ctid >= '(1000,0)'));